A South Australian Government taskforce will work to secure a long-term future for the Nyrstar lead and zinc smelter at Port Pirie.

Premier Jay Mr Weatherill has met company officials during his two-day visit to the state's mid-north.

Mr Weatherill says the Government has pledged support for the smelter and its proposed redevelopment but he will not say what form it will take.

"We've been having extensive discussions with federal colleagues, from the Prime Minister to a number of senior ministers, and we're certainly putting a lot of resources into the question of the future of Nyrstar," he said.

"They're very detailed discussions and I'm not at liberty to reveal them, except to say we're in detailed dialogue with the company."

Mr Weatherill says the taskforce established several months ago shows the issue is a priority for the SA Government.

Nyrstar is keen to redevelop the smelter within five years and says it is likely to cost about $500 million.